When comparing Segoe UI Mono vs Courier Prime, the Slant community recommends Segoe UI Mono for most people. In the question“What are the best programming fonts?”Segoe UI Mono is ranked 37th while Courier Prime is ranked 83rd. The most important reason people chose Segoe UI Mono is:

Pro

Even spacing

Pro

Support for standard font weights

Cons

Con

The zero is not slashed

The zero is not slashed, which causes some problems when scanning source code. This is not an issue when the IDE supports coloring (like all major modern IDE's), but still there are instances where this is not the case. A primary example are T4 templates, where Microsoft has not yet provided coloring support.